package com.cloudptt.wp.ui.address.map;

import com.cloudptt.wp.ui.address.map.data.Point;

public class PositionUtils {
	private static final double x_pi = 3.14159265358979324 * 3000.0 / 180.0;
	private static final double pi = 3.14159265358979324;
	private static final double a = 6378245.0;
	private static final double ee = 0.00669342162296594323;
	
	//int to double
	public static double int2double(int[] x){
		double result;
		result = x[0] + x[1]/60 + x[2]/3600;
		return result;
	}
	
	private static boolean outOfChina(double lon, double lat){
		if (lon < 72.004 || lon > 137.8347) {
			return true;
		}
		if (lat < 0.8293 || lat > 55.8271) {
			return true;
		}
		return false;
	}
	
	//WGS-84 to GCJ-02 
	public static Point wgs2gcj(double wgLon, double wgLat){
		Point point = new Point();
//		if (outOfChina(wgLat, wgLon)) {
//			point.setLat(wgLat);
//			point.setLng(wgLon);
//			return point;
//		}
		double dLat = transformLat(wgLon - 105.0, wgLat - 35.0);
		double dLon = transformLon(wgLon - 105.0, wgLat - 35.0);
		double radLat = wgLat / 180.0 * pi;
		double magic = Math.sin(radLat);
		magic = 1 - ee * magic * magic;
		double sqrtMagic = Math.sqrt(magic);
		dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
		dLon = (dLon * 180.0) /(a / sqrtMagic * Math.cos(radLat) * pi);
		double lat = wgLat + dLat;
		double lon = wgLon + dLon;
		point.setLat(lat);
		point.setLng(lon);
		return point;
		
	}
	
	private static double transformLat(double x, double y){
		double ret = -100.0 + 2.0 * x + 3.0 * y + 0.2 * y * y + 0.1 * x * y + 0.2 * Math.sqrt(Math.abs(x));
		ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
		ret += (20.0 * Math.sin( y * pi) + 40.0 * Math.sin(y / 3.0 * pi)) * 2.0 / 3.0;
		ret += (160.0 * Math.sin(y / 12.0 * pi) + 320 * Math.sin(y * pi / 30.0)) * 2.0 / 3.0;
		return ret;
	}
	
	private static double transformLon(double x, double y){
		double ret = 300.0 + x + 2.0 * y + 0.1 * x * x + 0.1 * x * y + 0.1 * Math.sqrt(Math.abs(x));
		ret += (20.0 * Math.sin(6.0 * x * pi) + 20.0 * Math.sin(2.0 * x * pi)) * 2.0 / 3.0;
		ret += (20.0 * Math.sin(x * pi) + 40.0 * Math.sin(x / 3.0 *pi)) * 2.0 / 3.0;
		ret += (150.0 * Math.sin(x / 12.0 * pi) + 300.0 * Math.sin(x / 30.0 * pi)) * 2.0 / 3.0;
		return ret;
	}
	
	public static void transform(double wgLat, double wgLon, double[] latlng){
//		if (outOfChina(wgLat, wgLon)) {
//			latlng[0] = wgLat;
//			latlng[1] = wgLon;
//			return;
//		}
		double dLat = transformLat(wgLon - 105.0, wgLat - 35.0);
		double dLon = transformLon(wgLon - 105.0, wgLat - 35.0);
		double radLat = wgLat / 180.0 * pi;
		double magic = Math.sin(radLat);
		magic = 1 - ee * magic * magic;
		double sqrtMagic = Math.sqrt(magic);
		dLat = (dLat * 180.0) / ((a * (1 - ee)) / (magic * sqrtMagic) * pi);
		dLon = (dLon * 180.0) /(a / sqrtMagic * Math.cos(radLat) * pi);
		double lat = wgLat + dLat;
		double lon = wgLon + dLon;
		latlng[0] = lat;
		latlng[1] = lon;
	}

}
